Helmuth Lütjens, Paul Cassirer Amsterdam and Max Beckmann in: “Come on, now buy a Beckmann too!“ Portrait of the Lütjens Family in the Museum Boijmans van Beuningen, exhibition catalogue Boijmans van Beuningen, Rotterdam 2011, p. 88-96. Posted Thursday May 11th, 2017 by Ehud Neuhaus